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Achromatic Doublets

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  • An achromatic doublet is the combination of positive and negative elements with different refractive indices. They are computer-optimized to correct for on-and off-axis spherical and chromatic aberrations. When these doublets are used to focus or collimate, the most steeply curved (shortest radius) surface should face the collimated light.


Material: Crown, Flint
Focal Length Tolerance: ±0.5%
Diameter Tolerance: +0/-0.1mm
Thickness Tolerance: ±0.2mm
Surface Flatness: lambda/4
Centration Error: <3 arcmin
Surface Quality:


Clear Aperture: >90% of central diameter
Coating: A single layer MgF2